i40e: Fix ethtool coalesce settings

This patch fixes the i40e_set_coalesce function to allow 0 as a disable
value.  Also, added message to user about invalid value and provides valid
range.

Change-ID: I6c9ff11a9861f2045bd543745a3d132999ffbbd8
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

3 files changed, 40 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 817e179dc3f9..07811dd6eb89 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -617,6 +617,7 @@ static inline void i40e_dbg_init(void) {}
 static inline void i40e_dbg_exit(void) {}
 #endif /* CONFIG_DEBUG_FS*/
 void i40e_irq_dynamic_enable(struct i40e_vsi *vsi, int vector);
+void i40e_irq_dynamic_disable(struct i40e_vsi *vsi, int vector);
 void i40e_irq_dynamic_disable_icr0(struct i40e_pf *pf);
 void i40e_irq_dynamic_enable_icr0(struct i40e_pf *pf);
 int i40e_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 4a488ffcd6b0..7da37581bc02 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1105,17 +1105,36 @@ static int i40e_set_coalesce(struct net_device *netdev,
         if (ec->tx_max_coalesced_frames_irq || ec->rx_max_coalesced_frames_irq)
                 vsi->work_limit = ec->tx_max_coalesced_frames_irq;
 
+        vector = vsi->base_vector;
         if ((ec->rx_coalesce_usecs >= (I40E_MIN_ITR << 1)) &&
-            (ec->rx_coalesce_usecs <= (I40E_MAX_ITR << 1)))
+            (ec->rx_coalesce_usecs <= (I40E_MAX_ITR << 1))) {
                 vsi->rx_itr_setting = ec->rx_coalesce_usecs;
-        else
+        } else if (ec->rx_coalesce_usecs == 0) {
+                vsi->rx_itr_setting = ec->rx_coalesce_usecs;
+                i40e_irq_dynamic_disable(vsi, vector);
+                if (ec->use_adaptive_rx_coalesce)
+                        netif_info(pf, drv, netdev,
+                                   "Rx-secs=0, need to disable adaptive-Rx for a complete disable\n");
+        } else {
+                netif_info(pf, drv, netdev,
+                           "Invalid value, Rx-usecs range is 0, 8-8160\n");
                 return -EINVAL;
+        }
 
         if ((ec->tx_coalesce_usecs >= (I40E_MIN_ITR << 1)) &&
-            (ec->tx_coalesce_usecs <= (I40E_MAX_ITR << 1)))
+            (ec->tx_coalesce_usecs <= (I40E_MAX_ITR << 1))) {
                 vsi->tx_itr_setting = ec->tx_coalesce_usecs;
-        else
+        } else if (ec->tx_coalesce_usecs == 0) {
+                vsi->tx_itr_setting = ec->tx_coalesce_usecs;
+                i40e_irq_dynamic_disable(vsi, vector);
+                if (ec->use_adaptive_tx_coalesce)
+                        netif_info(pf, drv, netdev,
+                                   "Tx-secs=0, need to disable adaptive-Tx for a complete disable\n");
+        } else {
+                netif_info(pf, drv, netdev,
+                           "Invalid value, Tx-usecs range is 0, 8-8160\n");
                 return -EINVAL;
+        }
 
         if (ec->use_adaptive_rx_coalesce)
                 vsi->rx_itr_setting |= I40E_ITR_DYNAMIC;
@@ -1127,7 +1146,6 @@ static int i40e_set_coalesce(struct net_device *netdev,
         else
                 vsi->tx_itr_setting &= ~I40E_ITR_DYNAMIC;
 
-        vector = vsi->base_vector;
         for (i = 0; i < vsi->num_q_vectors; i++, vector++) {
                 q_vector = vsi->q_vectors[i];
                 q_vector->rx.itr = ITR_TO_REG(vsi->rx_itr_setting);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index b4278a22382c..71efc68c5d99 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2768,6 +2768,22 @@ void i40e_irq_dynamic_enable(struct i40e_vsi *vsi, int vector)
 }
 
 /**
+ * i40e_irq_dynamic_disable - Disable default interrupt generation settings
+ * @vsi: pointer to a vsi
+ * @vector: enable a particular Hw Interrupt vector
+ **/
+void i40e_irq_dynamic_disable(struct i40e_vsi *vsi, int vector)
+{
+        struct i40e_pf *pf = vsi->back;
+        struct i40e_hw *hw = &pf->hw;
+        u32 val;
+
+        val = I40E_ITR_NONE << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT;
+        wr32(hw, I40E_PFINT_DYN_CTLN(vector - 1), val);
+        i40e_flush(hw);
+}
+
+/**
  * i40e_msix_clean_rings - MSIX mode Interrupt Handler
  * @irq: interrupt number
  * @data: pointer to a q_vector